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[EDIT] FILE: FileList.php

<?php
/**
 * Class to retrieve a filtered file list.
 *
 * @author    Juliette Reinders Folmer <phpcs_nospam@adviesenzo.nl>
 * @copyright 2019 Juliette Reinders Folmer. All rights reserved.
 * @license   https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/HEAD/licence.txt BSD Licence
 */

namespace PHP_CodeSniffer\Tests;

use RecursiveDirectoryIterator;
use RecursiveIteratorIterator;
use RegexIterator;

class FileList
{

/**
     * The path to the project root directory.
     *
     * @var string
     */
    protected $rootPath;

/**
     * Recursive directory iterator.
     *
     * @var \DirectoryIterator
     */
    public $fileIterator;

/**
     * Base regex to use if no filter regex is provided.
     *
     * Matches based on:
     * - File path starts with the project root (replacement done in constructor).
     * - Don't match .git/ files.
     * - Don't match dot files, i.e. "." or "..".
     * - Don't match backup files.
     * - Match everything else in a case-insensitive manner.
     *
     * @var string
     */
    private $baseRegex = '`^%s(?!\.git/)(?!(.*/)?\.+$)(?!.*\.(bak|orig)).*$`Dix';

/**
     * Constructor.
     *
     * @param string $directory The directory to examine.
     * @param string $rootPath  Path to the project root.
     * @param string $filter    PCRE regular expression to filter the file list with.
     */
    public function __construct($directory, $rootPath='', $filter='')
    {
        $this->rootPath = $rootPath;

$directory = new RecursiveDirectoryIterator(
            $directory,
            RecursiveDirectoryIterator::UNIX_PATHS
        );
        $flattened = new RecursiveIteratorIterator(
            $directory,
            RecursiveIteratorIterator::LEAVES_ONLY,
            RecursiveIteratorIterator::CATCH_GET_CHILD
        );

if ($filter === '') {
            $filter = sprintf($this->baseRegex, preg_quote($this->rootPath));
        }

$this->fileIterator = new RegexIterator($flattened, $filter);

return $this;

}//end __construct()

/**
     * Retrieve the filtered file list as an array.
     *
     * @return array
     */
    public function getList()
    {
        $fileList = [];

foreach ($this->fileIterator as $file) {
            $fileList[] = str_replace($this->rootPath, '', $file);
        }

return $fileList;

}//end getList()

}//end class

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